The Darkside-20k Dark Matter Detector

银河系暗物质的探测及其基本性质的确定是粒子物理学中的一个非常高的优先事项。对大质量弱相互作用大质量粒子（WIMP）暗物质最灵敏的直接搜索是使用大型液态惰性气体探测器来搜索核反冲，我们的目标是在液态氩中实现对大气中微子在探测器中相干散射并产生模拟WIMP暗物质的反冲所引起的“中微子底”的灵敏度下降。我们目前的探测器名为“DEAP-3600”，位于SNOLAB，装有约3.3吨液态氩，是目前世界上最灵敏的氩暗物质探测器。液态氩的光发射特性已经在DEAP中得到证实，可以在中微子层对氡和太阳中微子等其他背景进行大于108的区分。 该提案请求支持，以使加拿大研究人员能够参与“Darkside--20 k”探测器，这是一个大型液氩时间投影室（TPC），将位于意大利的格兰萨索实验室，它将扩大液氩暗物质探测的范围。一个数量级。加拿大团体已经开始在DarkSide-20 k计划的几个方面开展工作，特别是在他们过去有丰富经验的领域：硅光电倍增管数据采集系统和电子设备，地下氩工厂和随后的存储和处理，探测器的设计，将在加拿大用丙烯酸建造的独特TPC，以及制造和涂覆丙烯酸树脂的程序，其中用于TPC组件的电阻涂层和用于波长偏移的TPB。与这些活动相关的主要资本费用已在一份单独的原讼法庭建议书中提出，总价值为2，200万美元。DarkSide-20 k将具有超低的背景，可以在现场测量。这将使质量为1 TeV/c2（10 TeV/c2）的WIMP对1.2 x 10- 47 cm 2（1.1 x 10-46 cm 2）的WIMP-核子截面的灵敏度，在5年运行期间产生100吨-年的暴露，没有任何仪器背景。在意大利的实验完成后，计划建造一个更大的400吨探测器（Argo），将位于萨德伯里的SNOLAB地下实验室。 .

The detection of galactic dark matter and the establishment of its fundamental properties are a very high priority in particle physics. The most sensitive direct searches for high mass WIMP (weakly interacting massive particle) dark matter use large liquid noble gas detectors to search for nuclear recoils.Our objective is a program in liquid argon to reach down in sensitivity to the "Neutrino Floor" caused by atmospheric neutrinos coherently scattering in the detector and generating recoils that simulate WIMP dark matter. This objective has resulted in the joining together of all the argon dark matter researchers in the world, to form a global argon dark matter collaboration.Our current detector, called "DEAP--3600", contains about 3.3 tonnes of liquid argon, is situated in SNOLAB,  and is currently the most sensitive argon dark matter detector in the world. The light emission properties of liquid argon have already been demonstrated in DEAP to enable discrimination greater than 108 against other backgrounds such as radon and solar neutrinos at the Neutrino Floor.  This proposal is requesting support to enable Canadian researchers to participate in the "Darkside--20k" detector, a large liquid argon time projection chamber(TPC) that will be situated in the Gran Sasso Laboratory in Italy that will extend the reach of liquid argon dark matter detection by an order of magnitude. Canadian groups have started to work on several aspects of the DarkSide--20k program, particularly in areas where they have strong past experience: the silicon-photomultiplier data acquisition system and electronics, the underground argon plant and subsequent storage and processes, the design of the detector, the unique TPC to be built from acrylic in Canada, and the procedures to fabricate and coat acrylic with resistive coatings for TPC components and with TPB for wavelength shifting. The main capital costs associated with these activities have been requested in a separate CFI proposal, with a total value of $22M. DarkSide-20k will have ultra-low backgrounds that can be measured in situ. This will give sensitivity to WIMP--nucleon cross sections of 1.2 x 10--47 cm2(1.1 x 10-46 cm2) for WIMPs of 1 TeV/c2 (10 TeV/c2) mass, to be achieved during a 5 year run producing an exposure of 100 tonne--year free from any instrumental background. After the experiment in Italy is complete, the plan is to build an even larger detector of 400 tonnes (Argo) that will be located at the SNOLAB underground laboratory in Sudbury.  .